<?php

// +----------------------------------------------------------------------

// | YBlog

// +----------------------------------------------------------------------

// | Copyright (c) 2008 http://www.yhustc.com All rights reserved.

// +----------------------------------------------------------------------

// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )

// +----------------------------------------------------------------------

// | Author: yhustc <yhustc@gmail.com>

// +----------------------------------------------------------------------

// $Id$


/**
 *
 * +------------------------------------------------------------------------------
 * RSS生成类
 *
 * +------------------------------------------------------------------------------
 * @author    yhustc <yhustc@gmail.com>
 * @version   $Id$
 *
 * +------------------------------------------------------------------------------
 */

namespace core\utils;

class RSS {

    /**
     *
     * +----------------------------------------------------------
     * RSS频道名
     *
     * +----------------------------------------------------------
     * @var string
     * @access protected
     *
     * +----------------------------------------------------------
     */

    protected $channel_title = '';

    /**
     *
     * +----------------------------------------------------------
     * RSS频道链接
     *
     * +----------------------------------------------------------
     * @var string
     * @access protected
     *
     * +----------------------------------------------------------
     */

    protected $channel_link = '';

    /**
     *
     * +----------------------------------------------------------
     * RSS频道描述
     *
     * +----------------------------------------------------------
     * @var string
     * @access protected
     *
     * +----------------------------------------------------------
     */

    protected $channel_description = '';

    /**
     *
     * +----------------------------------------------------------
     * RSS频道使用的小图标的URL
     *
     * +----------------------------------------------------------
     * @var string
     * @access protected
     *
     * +----------------------------------------------------------
     */

    protected $channel_imgurl = '';

    /**
     *
     * +----------------------------------------------------------
     * RSS频道所使用的语言
     *
     * +----------------------------------------------------------
     * @var string
     * @access protected
     *
     * +----------------------------------------------------------
     */

    protected $language = 'zh_CN';

    /**
     *
     * +----------------------------------------------------------
     * RSS文档创建日期，默认为今天
     *
     * +----------------------------------------------------------
     * @var string
     * @access protected
     *
     * +----------------------------------------------------------
     */

    protected $pubDate = '';

    protected $lastBuildDate = '';


    protected $generator = 'Jingui RSS Generator';


    /**
     *
     * +----------------------------------------------------------
     * RSS单条信息的数组
     *
     * +----------------------------------------------------------
     * @var string
     * @access protected
     *
     * +----------------------------------------------------------
     */

    protected $items = [];


    /**
     *
     * +----------------------------------------------------------
     * 构造函数
     *
     * +----------------------------------------------------------
     * @access public
     *
     * +----------------------------------------------------------
     * @param string $title RSS频道名
     * @param string $link RSS频道链接
     * @param string $description RSS频道描述
     * @param string $imgurl RSS频道图标
     *
     * +----------------------------------------------------------
     */

    public function __construct ($title, $link, $description, $imgurl = '') {

        $this->channel_title = $title;

        $this->channel_link = $link;

        $this->channel_description = $description;

        $this->channel_imgurl = $imgurl;

        $this->pubDate = Date('Y-m-d H:i:s', time());

        $this->lastBuildDate = Date('Y-m-d H:i:s', time());

    }


    /**
     *
     * +----------------------------------------------------------
     * 设置私有变量
     *
     * +----------------------------------------------------------
     * @access public
     *
     * +----------------------------------------------------------
     * @param string $key 变量名
     * @param string $value 变量的值
     *
     * +----------------------------------------------------------
     */

    public function Config ($key, $value) {

        $this->{$key} = $value;

    }


    /**
     *
     * +----------------------------------------------------------
     * 添加RSS项
     *
     * +----------------------------------------------------------
     * @access public
     *
     * +----------------------------------------------------------
     * @param string $title 日志的标题
     * @param string $link 日志的链接
     * @param string $description 日志的摘要
     * @param string $pubDate 日志的发布日期
     *
     * +----------------------------------------------------------
     */

    function AddItem ($title, $link, $description, $pubDate) {

        $this->items[] = ['title' => $title, 'link' => $link, 'description' => $description, 'pubDate' => $pubDate];

    }


    /**
     *
     * +----------------------------------------------------------
     * 输出RSS的XML为字符串
     *
     * +----------------------------------------------------------
     * @access public
     *
     * +----------------------------------------------------------
     * @return string
     *
     * +----------------------------------------------------------
     */

    public function Fetch () {

        $rss = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\r\n";

        $rss = "<rss version=\"2.0\">\r\n";

        $rss .= "<channel>\r\n";

        $rss .= "<title><![CDATA[{$this->channel_title}]]></title>\r\n";

        $rss .= "<description><![CDATA[{$this->channel_description}]]></description>\r\n";

        $rss .= "<link>{$this->channel_link}</link>\r\n";

        $rss .= "<language>{$this->language}</language>\r\n";


        if (!empty($this->pubDate))

            $rss .= "<pubDate>{$this->pubDate}</pubDate>\r\n";

        if (!empty($this->lastBuildDate))

            $rss .= "<lastBuildDate>{$this->lastBuildDate}</lastBuildDate>\r\n";

        if (!empty($this->generator))

            $rss .= "<generator>{$this->generator}</generator>\r\n";


        $rss .= "<ttl>5</ttl>\r\n";


        if (!empty($this->channel_imgurl)) {

            $rss .= "<image>\r\n";

            $rss .= "<title><![CDATA[{$this->channel_title}]]></title>\r\n";

            $rss .= "<link>{$this->channel_link}</link>\r\n";

            $rss .= "<url>{$this->channel_imgurl}</url>\r\n";

            $rss .= "</image>\r\n";

        }


        for ($i = 0; $i < count($this->items); $i++) {

            $rss .= "<item>\r\n";

            $rss .= "<title><![CDATA[{$this->items[$i]['title']}]]></title>\r\n";

            $rss .= "<link>{$this->items[$i]['link']}</link>\r\n";

            $rss .= "<description><![CDATA[{$this->items[$i]['description']}]]></description>\r\n";

            $rss .= "<pubDate>{$this->items[$i]['pubDate']}</pubDate>\r\n";

            $rss .= "</item>\r\n";

        }


        $rss .= "</channel>\r\n</rss>";
        dump($rss);

        return $rss;

    }


    /**
     *
     * +----------------------------------------------------------
     * 输出RSS的XML到浏览器
     *
     * +----------------------------------------------------------
     * @access public
     *
     * +----------------------------------------------------------
     * @return void
     *
     * +----------------------------------------------------------
     */

    public function Display () {

        header("Content-Type: text/xml; charset=utf-8");

        echo $this->Fetch();

        //        exit;

    }

}

